alkalinity

Question
Hi Renee, I was wondering if you can tell me all about alkalinity and the levels good and bad that it has. I looked all over google and cannot find a single clear answer. The answers are all over the place.
              Thanks

Answer
Hello Cassandra,

I require some information before I answer your question.

What kind of fish are we talking about?  Are they freshwater or saltwater or brackish?

It does matter which kind of fish likes what type of alkalinity, so it would really help.

Renee